Self adjusting construction tie-down

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Washer structure – Including adjustable thickness means

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Details

411354, 411539, F16B 1900, F16B 4300

Patent

active

053642147

ABSTRACT:
A uni-directional slack adjuster is incorporated into a hold-down tension rod or strap, such as a hold-down anchor bolt for bolting a shear wall on one floor to a shear wall or foundation wall below, when a wood floor joist assembly is in between. The slack adjuster eliminates bolt slack so that in the event of an earthquake or hurricane, the sill plate is positively anchored with no vertical bolt play, eliminating much of the cosmetic damage that is often done to the wallboard and other finished surfaces due to distortion of the wallboard framing as the sill rises abruptly until it reaches the end of travel on the hold-down bolts. The slack adjuster comprises a link in the tensioner and non-reversibly either expands or contracts axially depending on the particular embodiment. The mechanism used can be laterally extended wedges biased into other wedges, one-way clutch-type construction or ratchet engagement, all of which act to decrease the effective length of the tensioning device to take up the slack space which results from wood shrinkage occurring after the tensioning devices have already been installed.

REFERENCES:
patent: 1347687 (1920-07-01), Ellis et al.
patent: 1746978 (1930-02-01), Winkler
patent: 1953354 (1934-04-01), Holland-Letz
patent: 1966780 (1934-07-01), Wyrick
patent: 2405889 (1946-08-01), Kennedy
patent: 4433879 (1984-02-01), Morris
patent: 4708555 (1987-11-01), Terry
patent: 5180268 (1993-01-01), Richardson

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